William Optics Cats

William Optics Cat series is the original small and fast astrograph Petzval refractor. The RedCat and SpaceCat series deliver high quality imaging for APS-C class cameras, while the UltraCat (and Cat 91) deliver exceptional Full Frame corner to corner sharpness and next level optical performance.

The UltraCat 56 is 41% sharper out to full frame corners vs the RedCat 51, and offers improved star sharpness across the whole field of view to support the highest resolution cameras.